Meteorological Observations. vii 



Abstract of the Results of the Hourly Meteorological Observations 



taken at the Surveyor General's Office, Calcutta, in the 



month of January 1867. 



Monthly Results. 



Indies. 



Mean height of the Barometer for the month .. . ... ... 30.048 



Max. height of the Barometer occurred at 9 a.m. on the 11th ... 30.248 



Min. height of the Barometer occurred at 4 p. m. on the 23rd ... 29.886 



Extreme range of the Barometer during the month ... ... 0.3(32 



Mean of the daily Max. Pressures ... ... ... ... 30.125 



Ditto ditto Min. ditto ... ... ... ... 29.989 



Mean daily range of the Barometer during the month ... ... 0.136 



Mean Dry Bulb Thermometer for the month ... 69.0 



Max. Temperature occurred at 3 p. M. on the 1st 22nd & 25th ... 83.2 



Min. Temperature occurred at 7 a. m. on the 28th 55.2 



Extreme range of the Temperature during the month 28.0 



Mean of the daily Max. Temperature ... ... 78.4 



Ditto ditto Min. ditto, ... ... 61.4 



Mean daily range of the Temperature during the month... ... 17.0 



Mean Wet Bulb Thermometer for the month ... ... ... 63.1 



Mean Dry Bulb Thermometer above Mean "Wet Bulb Thermometer 5.9 



Computed Mean Dew-point for the month ... ... ... 58.4 



Mean Dry Bulb Thermometer above computed mean Dew-point ... 10.6 



Inches. 

 Mean Elastic force of Vapour fo r the month ... ... ... 0.496 



Troy grain. 



Mean Weight of Vapour for the month ... ... ... 5.46 



Additional Weight of Vapour required for complete saturation ... 2.30 

 Mean degree of humidity for the month, complete saturation being unity 0.70 



Inches. 



Rained 4 days, — Max. fall of rain during 24 hours ... ... 0.48 



Total amount of rain during the month ... ... ... 0.55 



Total amount of rain indicated by the Gauge attached to the anemo- 

 meter during the month ... ... ... ... ... 0.53 



Prevailing direction of the Wind N. W. & N. by W. 



